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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d04ebfbc0b2cee219939ac6c8087d1a3926abb70961095db0d5567d639e282' 
  AND token = '2sFy3E9n9nxEOv5hp+HNoezylrZ+FKB6pOKM/b1po3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}